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Help with dd13 fuel economy

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Cory wood, Nov 7, 2015.

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  1. Nov 7, 2015 #1
    Cory wood

    Cory wood Medium Load Member

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    Nov 7, 2015
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    I have 5 dd13 in cascadias. 4 are day and and I is a small sleeper. My day and run here in Texas pulling dump trailers grossing 84k and are doing a little over 6mpg average. The one with a sleeper is running a flatbed on a dedicated haul about 230 miles one way and the same back. He grosses usually 76k or so and he's only averaging 5.5 mpg. They are all 410/1450 engines with ten speeds. Is there something going on with the one that's doing worse on fuel? They are all 2015 except the sleeper truck we bought used its a 2013
     
    Cory wood, Nov 7, 2015
    Cory wood, Nov 7, 2015
    #1
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  3. Nov 7, 2015 #2
    RoadRooster

    RoadRooster Road Train Member

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    Fort Myers, Florida
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    switch drivers see if the truck the bad truck does better... I would think a Cascadia even with nearly 80,000 pounds...basically over the road driving, should get 6.5 mpg
     
    RoadRooster, Nov 7, 2015
    RoadRooster, Nov 7, 2015
    #2
  4. Nov 7, 2015 #3
    Cory wood

    Cory wood Medium Load Member

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    This driver was the one driving a truck with a dump trailer doing 6.375 on fuel with more weight. I have them governed at 68 mph and progressive shift turned on and set at 1550 rpms.
     
    Cory wood, Nov 7, 2015
    Cory wood, Nov 7, 2015
    #3
  5. Nov 7, 2015 #4
    RoadRooster

    RoadRooster Road Train Member

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    Fort Myers, Florida
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    it sounds like its mechanical...not an operator failure.

    hopefully somebody else here can help you with that end of it good luck
     
    RoadRooster, Nov 7, 2015
    RoadRooster, Nov 7, 2015
    #4
  7. Nov 7, 2015 #5
    daf105paccar

    daf105paccar Road Train Member

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    2 things . 1°what shape is the flatbed load? 2° engine is controlled by computers.The '13 might be in need off software update if the mechanical parts are good.
     
    daf105paccar, Nov 7, 2015
    daf105paccar, Nov 7, 2015
    #5
  8. Nov 7, 2015 #6
    Cory wood

    Cory wood Medium Load Member

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    Nov 7, 2015
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    Flatbed load is rebar so it's only maybe 16 inches at most off the deck, but the back haul is hardy board sitting about 4' high and its square. Truck has 175k miles on it
     
    Cory wood, Nov 7, 2015
    Cory wood, Nov 7, 2015
    #6
  9. Nov 8, 2015 #7
    JPenn

    JPenn Road Train Member

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    Northern Tier PA
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    If the day-cabs are in any sort of local or semi-local operation, chances are they're spending more time on secondary roads 55mph and under. The sleeper is likely spending a lot more time on or near the governed max, which isn't going to improve fuel mileage much.

    Just out of curiosity, what are the rear-end ratios?
     
    JPenn, Nov 8, 2015
    JPenn, Nov 8, 2015
    #7
  10. Nov 8, 2015 #8
    Cory wood

    Cory wood Medium Load Member

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    Nov 7, 2015
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    3.42 ratio. Running about 1450 or so at 68.
     
    Cory wood, Nov 8, 2015
    Cory wood, Nov 8, 2015
    #8
  11. Nov 8, 2015 #9
    RoadGator

    RoadGator Bobtail Member

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    May 14, 2011
    Sacramento, ca
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    Two ideas: Texas is 70mph plus most areas so drivers governed slower are inclined to hammer down against the governor using more fuel than required to maintain the speed. Second 1450 seems a bit high for best economy, try 65 at 1400, on a voluntary basis, saving the extra mph for whatever.
     
    RoadGator, Nov 8, 2015
    RoadGator, Nov 8, 2015
    #9
  12. Nov 9, 2015 #10
    daf105paccar

    daf105paccar Road Train Member

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    Does the sleeper truck have a wet kit?
     
    daf105paccar, Nov 9, 2015
    daf105paccar, Nov 9, 2015
    #10
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